Note: This procedure involves editing a game file;
create a backup copy of the file before proceeding. Use a text
editor to edit the "hardline.cfg" file. Add the case-sensitive
entry "CHEATING IS SOMETIMES USEFUL BUT FOR HOW LONG ???"
at the end of the file to enable cheat mode. Then, press one of
the following keys during game play to activate the corresponding
cheat function.

Key
Invincibility [X]
Kill all visible enemies [Backspace]
Full health [Insert]
Secondary weapon ammo [Page Up]
Main weapon ammo [Home]